Ontong Java II by Hans Klaar

Ah, some of John's photos of the Ontong Java II build can be found here1 and here2 at Wharram Builders and Fiends :)

1 tag ‘‘Ontong’’ 16 pics now.
2 tag ‘‘ontong’’ 1 pic now. - (only a capital difference)​

Anybody more links or info :?:

Cheers,
Angel
 
Sailing World, post on May 15, 2013, has a progress report of Hans from end 2012.

“Boat sails well, becoming a bit of a monster in winds under 5 knots, and wave action really is not something she likes due to being so light. Otherwise had a fast trip up from Cape Verde--17 days to the Azores (sailed in the slipstream of a failed hurricane, Nadine), and got a perfect lift almost halfway by Day 5. Then the lack of engine made itself felt [in the Azorean High], but once out had three days of strong northerlys before the long prayed for westerly clicked in.

Same went for the Azores to Cape Saint Vincent stretch. Four and a half days for 700 miles, only to get stuck 80 miles out with no wind, waiting for the inevitable bad weather--in winter not uncommon--to roll you. Which it did four days later and cracked the already compromised mast, so that I really have to nurse it (until I find a new tree). I am now in Lagos, in the Algarve, on mainland Portugal, hoping to lay the boat up for a month while I go and spend Christmas with my family in Switzerland.

Boat performs well over all. I have been singlehanding this 70-footer since the Cape Verde islands. That's how easy she is to handle. I also don't steer any more--my $3 bungee cord and tweaking of the sail does it all. So that frees one up to doing absolutely nothing. It was fun to work and paint in the Azorean high. But once up in the colder parts all that one could do was lay up in the bunk and read, drink hot tea, and wait for another day and just keep warm.”
Cheers,
Angel

PS - Post #30, ‘‘eaghties’’ must be ‘‘eighties’’, too late to edit that :o
 
May I ask some questions

Would anyone hazard a guess at planking thickness (1.5 inches sound right?), anyone hazard a guess at what was used as varnish? I do see total weight is 7 tonnes, that gives a clue. Yes I know I could ask Hans directly, (he actually sent me an email), however my guess is he has better things to do than waste time on the internet.

I seems there was no eletricity and hence no power tools in the build, must have made it harder. At the moment I am comparing Ontong Java to O Tahiti Nui Freedom, that seems to have a more rounded bottom, whereas Ontong Java has a more vee hull. I also note that the Vee angle (deadrise) is quite shallow for a multihull with no board. I assume this was to get shoal draught, also the heavier construction technique (versus say plywood) means that wider hulls can support hte weight better, and still provide adequate freeboard
 
It seems there was no eletricity and hence no power tools in the build, must have made it harder.

I've seen extension cords and an old electric drill in the now gone pictures earlier posted by John on this thread.

And a genset can be seen on several of the pictures here.

Cheers,
Angel

PS
From the links in post#31 more power tools can be seen, and maybe a rough guess of planking thickness can be made from those pics ?
 
well its a really dumb way to determine planking thickness, (smart way is to ask) but looks like 1.25 inches (5 pixels divided 444 ) x 9ft x 305= 31mm There is obviously a lot of possible error there, but the 5 pixels looks right. Maybe below the waterline the planks there are thicker
 
The west African pirogues of the same building style have a solid beam of wood some 40 - 50 cm (16'' - 20'') thick as a keel. See the PDF in post #30.

Cheers,
Angel
 
Last edited:
Thanks John
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Good luck!
Angel
 
Hello all,

Have some new information regarding Ontong Java I (now Mareva). Apprarently built 2007 in Senegal. Planking thickness is 45mm; this is heavy imho. Mareva apparently came out of the water at eleven tonnes, and went back at 10 tonnes. I assume the extra tonne was water saturated planking. A little thing is that Ontong java II used an outboard in a well, whereas the refitted Mareva uses an outboard on the centerline on a trailing hinged plank. Link from which information was from is below
wl 12/12 https://issuu.com/sunmedia/docs/wl-dec2012/7
 
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